Updated free-programming-interactive-tutorials-en.md (#4647)

* Updated free-programming-interactive-tutorials-en.md

Added 4 interactive courses.

* Updated free-programming-interactive-tutorials-en.md

Added correct number of newlines

* Update free-programming-interactive-tutorials-en.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

free-programming-interactive-tutorials-en.md

@@ -148,7 +148,7 @@
 * [Codecademy jquery track](https://www.codecademy.com/learn/jquery)
 * [ES6 Interactive Guide](http://stack.formidable.com/es6-interactive-guide/#/)
 * [Functional Programming in Javascript](https://github.com/ReactiveX/learnrx)
-* [Javascript Algorithms and Data Structures Certification](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript) - freeCodeCamp
+* [JavaScript Algorithms and Data Structures Certification](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript)
 * [Javascript interactive tutorial on CodeCademy](https://www.codecademy.com/learn/javascript)
 * [JavaScript interactive tutorial on CoderMania](http://www.codermania.com/javascript/lesson/1a/hello-world)
 * [Javascripting](https://github.com/sethvincent/javascripting)
@@ -166,6 +166,21 @@
 * [Learn AngularJS with free interactive lessons](http://www.learn-angular.org)
 
 
+#### Bootstrap
+
+* [Front End Libraries: Bootstrap](https://www.freecodecamp.org/learn/front-end-libraries/bootstrap)
+
+
+#### jQuery
+
+* [Front End Libraries: jQuery](https://www.freecodecamp.org/learn/front-end-libraries/jquery)
+
+
+#### React
+
+* [Front End Libraries: React](https://www.freecodecamp.org/learn/front-end-libraries/react)
+
+
 ### Kotlin
 
 * [Kotlin tutorial](https://kotlinlang.org/docs/tutorials/)